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Functional Description
Ethernet Interface
The MVME2603/2604 VMEmodule uses Digital EquipmentÕs
DECchip 21140 PCI Fast Ethernet LAN controller to implement an
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Ethernet interface that supports both AUI (via MVME712M) and
10Base-T/100Base-TX (via MVME761) connections. The balanced
differential transceiver lines are coupled via on-board
transformers.
The MVME2603/2604 routes its AUI and 10Base-T/100Base-TX
lines through the P2 connector to the transition module (as
illustrated in
Figure 1-22
and
Figure
1-22). The MVME712M front
panel has an industry-standard DB15 connector for an AUI
connection. The MVME761 supports 10Base-T/100Base-TX
connections.
Every MVME2603/2604 is assigned an Ethernet station address.
The address is $08003E2xxxxx, where xxxxx is the unique 5-nibble
number assigned to the board (i.e., every board has a different
value for xxxxx).
Each MVME2603/2604 displays its Ethernet station address on a
label attached to the base board in the PMC connector keepout area
just behind the front panel. In addition, the six bytes including the
Ethernet station address are stored in an SROM off the DECchip
Ethernet controller. That is, the value 08003E2xxxxx is stored in
SROM. At an offset of $1F2C, the upper four bytes (08003E2x) can
be read. At an offset of $1F30, the lower two bytes (xxxx) can be
read. The MVME2603/2604 debugger, PPCBug, has the capability
to retrieve or set the Ethernet station address via the CNFG
command.
If the data in SROM is lost, use the number on the label in the PMC
connector keepout area to restore it.
For the pin assignments of the transition module AUI or 10Base-
T/100Base-TX connector, refer to the userÕs manual for the
MVME712M or MVME761 (listed in the Related Documentation
appendix) respectively. Refer to the BBRAM/TOD Clock memory
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